@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap");

:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-soft: #fbfcfe;
  --text: #0f172a;
  --muted: #667085;
  --line: #e4e8f0;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
  --shadow-soft: 0 8px 20px rgba(15, 23, 42, 0.04);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  font-family: "Inter", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.06), transparent 30%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
}

.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 292px;
  background: var(--surface);
  border-right: 1px solid var(--line);
  position: fixed;
  inset: 0 auto 0 0;
  padding: 1.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  padding: 0.4rem 0.2rem 1.25rem;
  margin-bottom: 0.75rem;
}

.logo-img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: block;
  object-fit: contain;
  background: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.06);
}

.logo-text {
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.logo-subtext {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.nav-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.35rem;
}

.nav-link {
  display: block;
  padding: 0.8rem 0.95rem;
  border-radius: 0.8rem;
  text-decoration: none;
  color: #6b7280;
  font-weight: 500;
  border: none;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: #1f2937;
  background: #f3f4f6;
}

.nav-link.active {
  color: #1f2937;
  background: #e5e7eb;
}

.sidebar-section {
  margin-top: 1.35rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}

.sidebar-section-title {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.usecase-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.45rem;
}

.usecase-link {
  display: block;
  padding: 0.7rem 0.9rem;
  border-radius: 0.85rem;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.usecase-link:hover {
  color: #1f2937;
  background: #f3f4f6;
}

.usecase-link.active {
  color: #1f2937;
  background: #e5e7eb;
}

.detail-panel {
  margin-top: 1.15rem;
  padding: 1.1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow-soft);
}

.detail-panel h2,
.detail-panel h3 {
  margin-bottom: 0.75rem;
}

.detail-panel p {
  margin-bottom: 0;
}

.detail-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.detail-item {
  padding: 0.95rem 1rem;
  border-radius: 0.9rem;
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.detail-item strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.detail-item span {
  color: var(--muted);
  font-size: 0.96rem;
}

.usecase-image {
  width: 100%;
  object-fit: cover;
  border-radius: 0.9rem;
  border: 1px solid var(--line);
  margin-top: 0.15rem;
  display: block;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.card p {
  margin-bottom: 0;
  font-size: 0.96rem;
  flex: 1;
}

.sidebar-footer p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.main-content {
  flex: 1;
  margin-left: 292px;
  padding: 2.5rem 3rem 4rem;
  max-width: 1240px;
}

section {
  display: none;
  margin-bottom: 3rem;
  animation: fadeIn 0.35s ease-out;
}

section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.25rem, 4vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.05em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.55rem, 2.2vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 0.9rem;
}

h3 {
  font-size: 1.05rem;
  line-height: 1.3;
  margin-bottom: 0.55rem;
}

p {
  color: var(--muted);
  max-width: 70ch;
  font-size: 1rem;
  margin-bottom: 1.2rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.78rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(37, 99, 235, 0.16);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
}

.quick-stats,
.feature-grid {
  gap: 1rem;
}

.quick-stats {
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  margin-top: 1.5rem;
}

.mini-card,
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow-soft);
}

.mini-card {
  padding: 1rem 1.05rem;
}

.mini-card strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.mini-card span {
  display: block;
  color: var(--muted);
  font-size: 0.93rem;
}

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 1.4rem;
}

.card {
  margin: 15px 0;
  padding: 1.25rem 1.2rem;
}

.card p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.card-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.3rem;
}

.step-list {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.25rem;
}

.step-item {
  display: flex;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow-soft);
}

.step-number {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 800;
}

.step-content strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--text);
}

.usecase-card {
  min-height: 100%;
}

.usecase-page {
  padding-top: 0.25rem;
  border-top: 1px solid var(--line);
}

.usecase-page .usecase-image {
  margin-top: 1rem;
  height: auto;
  max-height: 420px;
}

.menu-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  z-index: 101;
  box-shadow: var(--shadow-soft);
}

.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.38);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.overlay.active {
  display: block;
  opacity: 1;
}

@media (max-width: 1080px) {
  .sidebar {
    width: 260px;
  }

  .main-content {
    margin-left: 260px;
    padding: 2rem;
  }
}

@media (max-width: 840px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: var(--shadow);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding: 5.5rem 1.25rem 2rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .main-content {
    padding: 5.25rem 1rem 1.75rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  .card,
  .mini-card,
  .step-item {
    padding: 1rem;
  }
}